关键词: 小麦, 宽幅播种, 干物质积累, 转运, 籽粒贡献

Abstract:

To investigate the effects of different sowing ways on the growth and yield formation of winter wheat, cultivar ‘Shangnong 5’ was studied on grain filling rate, dry matter accumulation and translocation of after anthesis by using the wide bed planting and conventional seed planting, respectively. Results indicated that the grain filling rate at quick-increase and slight-increase filling stage was significantly increased and the grout duration was significantly shortened than that of conventional seed planting, suggesting that the wide bed planting was beneficial to the accumulation of dry matter in various organs after flowering. It conforms to cubic polynomial: Y=b+b₁x+b₂x²+b₃x³, the dry matter accumulation of each organ was significantly increased and reached the maximum at 10-12 d after flowering, and then it was rapidly decreased. Compared with conventional treatment, the amount of dry matter transfer was increased by 17.92% in vegetative organs after flowering under wide bed planting treatment. The contribution rate of dry matter transfer in the vegetative organs to grains was above 45% at these two treatments. In brief, the rates of grain filling and dry matter transfer are significantly increased at the wide bed planting treatment, indicating that this cultivation way could increase the formation of wheat yield and reduce the effect of dry-hot wind at later growth stage and the influence of aging on wheat yield risk.

Key words: Wheat, Wide Bed Planting, Dry Matter Accumulation, Translocation, Contribution of Grains